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Grockit, a start-up that is trying to make online learning look pretty, has raised $20 million in funding. A good portion of the round comes from a partnership with Discovery Communications, which is the big media company behind the Discovery Channel, Animal Planet and other major properties. In addition to capital, Discovery also promises to market and promote Learnist, a visual learning tool Grockit launched in May. Other investors in the round include Summit Group, Atlas Venture, Benchmark Capital, Integral Capital Partners and GSV Capital.